Example code for Many2one & One2many fields

example_model.py

from odoo import models, fields


class ParentModel(models.Model):
    _name = 'parent.model'
    
    parent_field_1 = fields.Char(string="Parent Field 1")
    parent_field_2 = fields.Integer(string="Parent Field 2")
    
    # If you want to display child data, you must create One2many field.
    # The One2many field used for inverse field from Many2one field
    child_field_ids = fields.One2many('child.model', 'parent_field_id', string="Child IDS")


class ChildModel(models.Model):
    _name = 'child.model'
    
    child_field_1 = fields.Char(string="Child Field 1")
    child_field_2 = fields.Integer(string="Child Field 2")
    child_field_3 = fields.Boolean(string="Child Field 3")
    parent_field_id = fields.Many2one('parent.model', string="Parent ID")

example_view.xml

<odoo>
    <record model="ir.ui.view" id="view_parent_form">
        <field name="name">parent.model.form</field>
        <field name="model">parent.model</field>
        <field name="arch" type="xml">
            <form>
                <sheet>
                    <group>
                        <field name="parent_field_1"/>
                        <field name="parent_field_2"/>
                    </group>
                    <notebook>
                        <page string="Child Data">
                            <!-- you can display child data like code below -->
                            <field name="child_field_ids">
                                <tree>
                                    <field name="child_field_1"/>
                                    <field name="child_field_2"/>
                                    <field name="child_field_3"/>
                                </tree>
                            </field>
                        </page>
                    </notebook>
                </sheet>
            </form>
        </field>
    </record>
</odoo>

I am also looking for a similar solution, If anyone has found an answer to this please share

in my project I have the same relation and it's working fine
but when I delete the child record from the parent tree view (for example) it's being deleted from the database :(